As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT CORROSION FOUND ON CENTER RIB IN RT SIDE OF WING WALK WAY BETWEEN 2ND, 3RD AND 4TH LITING HOLES. WHILE INSPECTING THE CENTER SECTION IAW AD AND SB NR 31-R1 IAW METHOD NR 3 OF THE AD AND SB. THE CORROSION WAS REMOVED AND AFFECTED AREAS TREATED IAW AC 43-4A CHAP. 6 PARA. 640, PARA. 641. AND SB.31-R1. NO OTHER COROSION WAS FOUND.